I didn't have a "serious error" but had an error regarding the path after installing Platinum. Maybe you can try what they told me to do and it will help. XLN told me to do the following:
a) Search your computer for "Addictive Drums 2.dll" and delete all files with that name
b) Run the XLN Online Installer and let it repair your installation. This will ensure that only the correct plug-in files are left on your computer.
c) Go to the Advanced page in the Online Installer. That page will tell you where the 32-bit and 64-bit Addictive Drums plug-in DLLs are installed. If you're running the 64-bit version of your host (Sonar in this case), then you want to use the 64-bit plug-in file and vice versa.
d) The next step is to check the preferences in your host. The option is usually named "Paths", "VST paths" or "Plug-in paths". In those preferences, add the path to the correct plug-in and then hit the Rescan button. This should get rid of the "Wrong binary location" message.